<div class="dropdown">
  <button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">
    {{dropdownLabel}}
    <span class="caret"></span>
  </button>
    <ul class="dropdown-menu" aria-labelledby="dropdownMenu1" >
        <li ng-repeat="item in distinctItems">
            <label>
                <input type="checkbox" ng-model="item.selected" ng-click="filterChanged()">{{item.value}}
            </label>
        </li>
    </ul>
</div>